THE CANADIAN ENTOMOLOGIST. 399 



and Glenwood Springs, Colorado. I liave a specimen compared with the 

 types of both names, and Prof. Smith agrees wiili me in the reference. 

 YoseviitcB is grey, suffused with brown, and strigate with brown and 

 black. No. 277 is usually blue grey, less strigate, and though occasion- 

 ally tinged with brown throughout, lacks the brown strigations of the 

 other species. It is the ^^yose??ntcB" of Holland's figure and stood under 

 that name in the British Museum when I was there, though omitted by 

 mistake from Vol. IV of Hampson's Catalogue. It is also the '■''yosemitce'^ 

 of Smith, Trans. Am. Ent. Soc, XXIX, 201, 1903. The two are easily 

 confused, though I believe distinct, and I have seen both from Manitoba 

 and B. C, though as yet no yosemiice from Alberta. I use a manuscript 

 name for it in my own notes, but refrain from describing it until I learn 

 more about some of the closely allied species. Insti-uta Smith, described 

 from four males from De Claire, Man., (Trans. Am. Ent. Soc, XXXVI, 

 264, Nov. 1 910), is evidently a very close relation at best. Another near 

 ally which I feel very uncertain about is enthea Grt. Relicina Morr., 

 under which name the above species formerly passed, was described from 

 Waco, Texas. The type is stated to be at Cambridge, Mass. Prof. 

 Smith states that it is an ally of burgcssi. Sir George Hampson describes 

 and figures a Texas female as Parastichtis relicina, thus referring it to a 

 genus with unlashed eyes and unarmed tibiae. Fishia has lashed eyes 

 and mid and hind tibiae spined, though the spines vary greatly in number 

 and position, being seldom equal on the same pair of legs, and possibly 



occasionally absent. 



(To be continued.) 



SOME FURTHER OBSERVATIONS ON THE LIGHT-EMISSION 



OF AMERICAN LAMPYRID^: THE PHOTOGENIC 



FUNCTION AS A MATING ADAPTATION 



IN THE PHOTININI. 



BY F. ALEX. MCDERMOTT, WASHINGTON, D. C. 



In 1910, the writer (Can. Ent., 1910, Vol. 42, pp. 357-363) called at- 

 tention to the fact that the female of Photinus pyralis Linn. — the species of 

 Lampyrid that is very common within the city limits of Washington, 

 D.C., had been seen to flash following the emission of light by a male flying 

 above her, and also after the sudden flash of an electric light in the room 

 in which the insects had been kept in the dark. Since these observa- 

 tions were made it has been the writer's view that the photogenic function 

 was primarily a secondary sexual character in this species, and that 

 further study would reveal this fact. Accordingly, during the present 



December, 1911 



